FsmEval/AStateMachine.hpp

/* 
 * File:   AStateMachine.hpp
 * Author: jens
 *
 * Created on 21. Januar 2015, 05:20
 */

#ifndef ASTATEMACHINE_HPP
#define	ASTATEMACHINE_HPP

#include "AState.hpp"

template <class IdType>
class AStateMachine
{
public:

	AStateMachine()
	: m_firstState(0)
	, m_currState(0)
	{
	}
	
	virtual ~AStateMachine()
	{
	}
	
	AState<IdType>* currState()
	{
		if (!m_currState)
		{
			reset();
		}
		return m_currState;
	}
	
	virtual void reset()
	{
		setState(m_firstState->id());
	}
	
	void add(AState<IdType> *pState)
	{
		if (!pState)
		{
			return;
		}

		if (findById(pState->id()))
		{
			return;
		}
		
		if (!m_firstState)
		{
			m_firstState = pState;
		}
		else
		{
			AState<IdType> *pStateCurr = m_firstState;
			while(pStateCurr->m_pNext)
			{
				pStateCurr = pStateCurr->m_pNext;
			}
			pStateCurr->m_pNext = pState;
		}
		pState->registerStateMachine(this);
	}
	
	void setState(IdType stateId)
	{
		AState<IdType> *pStateNext = findById(stateId);

		if (!pStateNext)
		{
			return;
		}
		
		bool isTransition = (m_currState != pStateNext);

		m_currState = pStateNext;

		if (isTransition)
		{
			m_currState->onTransition();
		}
	}
	
private:
	AState<IdType> *m_firstState;
	AState<IdType> *m_currState;

	AState<IdType>* findById(IdType stateId)
	{
		AState<IdType> *pStateNext = m_firstState;

		if (pStateNext)
		{
			while(pStateNext->id() != stateId)
			{
				pStateNext = pStateNext->m_pNext;
				if (!pStateNext)
				{
					break;
				}
			}
		}
		return pStateNext;
	}
	
		
	
};


#endif	/* ASTATEMACHINE_HPP */